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ACS Sustainable Resource Management 2024年第2期1卷 344-354页

作者： Aline V. Duarte Laís T. Possari Lívia M. G. Gonçalves Baltus C. Bonse Talita R. Rigolin Sílvia H. P. Bettini Graduate Program in Materials Science and Engineering Federal University of Sao Carlos Rod. Washington Luiz 235 São Carlos 13565-905 Brazil Department of Materials Engineering Centro Universitário FEI 09850-901 São Bernardo do Campo Brazil Department of Materials Engineering Federal University of Sao Carlos Rod. Washington Luiz 235 São Carlos 13565-905 Brazil

Daily, vast amounts of waste are produced in the orange juice industry, a large part of which is reused in low-added-value products. In this work, orange vesicle fiber residues from the juice sieving stage were plasticized by extrusion, producing a thermoplastic citrus pulp (TCP). This pulp was incorporated into poly(butylene succinate) (PBS) at up to 50 wt %. The influence of TCP on the molar mass, morphology, tensile properties, rheological behavior, and biodeterioration of PBS in soil was evaluated. Highly flexible compounds with elongations similar to those of PBS were produced. Scanning electron microscopy analyses suggested good dispersion between the TCP and PBS phases, verified after acid extraction of pectin. Rheological analyses indicated the presence of strong interactions in the interconnected network formed by pectin gel, percolation of TCP lignocellulosic fibers, or both. Analyses of mass loss by burial in soil showed that the higher the TCP content in PBS is, the higher and faster the biodeterioration is. Size exclusion chromatography analyses indicated that the greater the concentration of TCP and the better dispersed it was in the compounds, the lower molar masses populations appeared in PBS, indicating higher rates of degradation of PBS in the presence of TCP. This innovative approach not only reuses the waste produced in the orange juice industry but also demonstrates the potential for obtaining environmentally friendly compounds.

关键词： Beverages Carbohydrates Fibers Polymers Soils

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Thermally Conductivity Study of One Micron AlN Deposition by Bipolar High Power Impulse Magnetron Sputtering

Thermally Conductivity Study of One Micron AlN Deposition by...

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IEEE International Conference on Interconnect Technology

作者： Ping-Che Lee Aaron J. McLeod Mingeun Cho Diego Vaca Satish Kumar Andrew C. Kummel Materials Science and Engineering Program University of California San Diego Department of Chemistry and Biochemistry University of California San Diego Georgia Institute of Technology

ISBN: (数字)9798350385175

ISBN: (纸本)9798350385182

High Power Impulse Magnetron Sputtering (HIPIMS) has emerged as a promising technique for the deposition of thin films with superior properties. In this study, HIPIMS was combined with a positive target bias (Kick voltage) process to enhance AlN film quality further. Aluminum Nitride (AlN) thin films were deposited using this method and characterized using Transmission Electron Microscopy (TEM) and X-Ray Diffraction (XRD). The thermal properties of the films were investigated using Frequency Domain Thermoreflectance (FDTR). The results show that the HIPIMS plus Kick process significantly improves the film quality, leading to enhanced thermal conductivity (112 W/m·K) compared to conventional techniques. This work demonstrates the potential of HIPIMS in producing high-quality thin films with improved thermal properties, making it suitable for various applications in electronics and thermal management.

关键词： Thermal management of electronics Transmission electron microscopy Microscopy Magnetic domains Thermoreflectance Conductivity Thermal conductivity III-V semiconductor materials Sputtering Aluminum nitride

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Design, Fabrication, and Characterisation of a Novel Piezoimpedal Tactile Sensor for use in Soft-Prosthetic Devices

Design, Fabrication, and Characterisation of a Novel Piezoim...

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IEEE/ASME (AIM) International Conference on Advanced Intelligent Mechatronics

作者： Thomas Searle Vitor Sencadas Gursel Alici Applied Mechatronics and Biomedical Engineering Research (AMBER) Group School of Mechanical Materials Mechatronic and Biomedical Engineering ARC Centre of Excellence for Electromaterials Science University of Wollongong New South Wales Australia Materials and Ceramic Engineering Department CICECO- Aveiro Institute of Materials University of Aveiro Aveiro Portugal

Enabling the robotic ability to sense tactile interactions is a complex and interdisciplinary challenge, as traditional pressure sensors made of hard and rigid materials struggle to replicate the soft and compliant interactions of mammalian somatosensory networks. This study investigates a novel matrixed contact sensor designed for use in soft robotics and biomedical prosthesis applications. The sensor is a coupled piezocapacitive-piezoresistive tactile sensor, optimized for scalability over various mechanical stimuli, including touch, pressure, bend, stretch, and proximity. By modifying the bulk geometry to include dielectric artifacts and integrating electroactive elastomeric composites, the soft and flexible sensor is fully mechanically compliant and conforms to skin behavior. The sensor has a maximum sensitivity of 0.028kPa -1 , a resolution of 1.3%, and a bandwidth of 29Hz. The study characterizes the sensor's performance and identifies its static and dynamic response to aid in developing complex, closed-loop tactile feedback control systems toward realizing the biomimetic implementation of synthetic skin in soft-prosthetic devices.

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Real-time in situ study of adsorption kinetics in PMMA thin films using infrared spectroscopy

Real-time in situ study of adsorption kinetics in PMMA thin ...

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Computational Optical Sensing and Imaging, COSI 2022

作者： Lee, Tse-Ang Kowal, Gina Peng, Jessie Hutter, Tanya Department of Mechanical Engineering University of Texas at Austin AustinTX78712 United States Department of Psychology University of Texas at Austin AustinTX78712 United States Department of Biomedical Engineering University of Texas at Austin AustinTX78712 United States Materials Science and Engineering Program Texas Materials Institute University of Texas at Austin AustinTX78712 United States

Studying adsorption in polymers is important for many applications. We present results on real-time in situ adsorption of ethanol and water in thin polymethyl methacrylate (PMMA) layers using attenuated total reflecti... 详细信息

ISBN: (纸本)9781557528209

关键词： Polymethyl methacrylates

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Transparent Porphyrin-Based Hybrid Films for Spectral Selective Solar Harvesting and Energy Generation

SSRN

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SSRN 2022年

作者： Shi, Donglu Lin, Jou Wang, Yuxin Lyu, Mengyao Deng, Zicheng The Materials Science and Engineering Program Department of Mechanical Materials Engineering College of Engineering and Applied Science University of Cincinnati CincinnatiOH45221 United States

Spectral-selectively solar harvest is achieved in designated frequency regions for photothermal energy generation. In this study, we have designed and synthesized porphyrin-based hybrids that typically exhibit two absorption peaks respectively near 400 nm (blue-violet) and 700 nm (NIR). To be able to tune the optical absorptions for more efficient solar harvest especially in the IR region, unique porphyrin hybrids are developed by incorporating another porphyrin compound such as phthalocyanine, and inorganic Fe 3 O 4 @Cu 2-x S nanoparticles with different absorption characteristics. By controlling the ratio of the components, the hybrids exhibit gradual and consistent changes in the optical spectra, showing high spectral tunability. Transparent thin films of the hybrids are deposited on glass substrates and constructed in parallel for 3D solar harvesting in a cuboid photothermal generator. Solar light is able to pass through the multilayers of thin films, generating significant thermal heat on each one for enhanced energy density. The structural features of the hybrids are well correlated to the optical behaviors based on Raman studies. Also discussed is the operating mechanisms underlying the photothermal behaviors associated with the hybrid structures. © 2022, The Authors. All rights reserved.

关键词： Multilayers

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Impact of In flux on self-assembled InGaN/GaN superlattice grown on GaN template by plasma-assisted molecular beam epitaxy

Impact of In flux on self-assembled InGaN/GaN superlattice g...

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2022 Compound Semiconductor Week, CSW 2022

作者： Khan, Kamruzzaman Sun, Kai Wurm, Christian Ahmadi, Elaheh University of Michigan Department of Materials Science and Engineering Ann ArborMI United States University of California Department of Electrical and Computer Engineering Santa BarbaraCA United States University of Michigan Department of Electrical Engineering and Computer Science Ann ArborMI United States University of Michigan Applied Physics Program Ann ArborMI United States

ISBN: (数字)9781665453400

ISBN: (纸本)9781665453400

We have previously reported spontanous formation of InGaN/GaN superlattice structure on nominal InGaN films grown by plasma-assisted molecular beam epitaxy (PAMBE). In this work, we report on the impact of In flux on the formation and periodicity of self-assembled InxGa1-xN/InyGa1-yN superlattice structure (SASL). We show that the thickness and In composition in the InGaN layer varies by changing the In flux. These films were stucturally characterized by X-ray diffraction and simulated by globalfit software to get the thickness and In composition. The superlattice structures were confimred by scanning transmission electron microscopy and the thickness of InGaN layer and In composition were determined by energy dispersive X-ray spectroscopy. This work can provide a method for using the SASL with better control for their optoelectronics application. © 2022 IEEE.

关键词： III-V semiconductors

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Multi-Component Lubricant Additives Derived from Pickering Emulsion-Templated Ionic Liquid Microcapsules

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Journal of Molecular Liquids 2025年 422卷

作者： Yan, Jieming Lak, Sarah N. Pentzer, Emily B. Mangolini, Filippo Texas Materials Institute The University of Texas at Austin AustinTX78712 United States Materials Science and Engineering Program The University of Texas at Austin AustinTX78712 United States Department of Chemistry Texas A&M University College StationTX77843 United States Department of Materials Science and Engineering Texas A&M University College StationTX77843 United States Walker Department of Mechanical Engineering The University of Texas at Austin AustinTX78712 United States

Room-temperature ionic liquids (RTILs) have emerged as potential next-generation lubricants owing to their unique physico-chemical properties and promising lubricating behavior. However, their implementation in tribological applications has partly been hindered by their negligible solubility in hydrocarbon fluids. Here, encapsulated ionic liquids (ENILs) with a core of 1-hexyl-3-imidazolium bis(trifluoromethylsulfonyl)imide ([HMIM][TFSI]) and a composite shell of polyurea/graphene oxide were prepared via Pickering emulsion-templated interfacial polymerization using two approaches, namely an RTIL-in-water emulsion stabilized with graphene oxide (GO) nanosheets ([HMIM][TFSI]/GO) and an RTIL-in-oil emulsion-stabilized with octadecylamine-functionalized GO nanosheets ([HMIM][TFSI]/C18-GO). The synthesized ENILs were successfully dispersed in polyalphaolefin (PAO) synthetic oil and used as additives to lubricate 52100 steel-vs.-52100 steel sliding contacts. Tribological tests provided evidence that the addition of [HMIM][TFSI]/C18-GO and [HMIM][TFSI]/GO ENILs to PAO could reduce friction and wear owing to the release of the encapsulated [HMIM][TFSI] at the sliding interface after the mechanical breakage of the shell material at the contact inlet, but only if a significant fraction of the ENILs has a diameter smaller than 20 µm. Comparison of these results with the outcomes of sliding experiments performed with PAO containing ENIL obtained by mini-emulsion polymerization with poly(ethylene glycol dimethacrylate-co-buytl methacrylate) (poly(EGDM-c-BMA)) shells highlights the role of the shell material in reducing friction. These outcomes not only demonstrate that multiple parameters (i.e., size distribution, shell material) affect the tribological performance of ENILs, but also pave the way towards further systematic investigations for optimizing ENILs to be used as additives in oil formulations. © 2025 Elsevier B.V.

关键词： Emulsification

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BiVO4-Decorated Graphite Felt as Highly Efficient Negative Electrode for All-Vanadium Redox Flow Batteries

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ACS Applied Energy materials 2023年第6期6卷 3301-3311页

作者： Kabtamu, Daniel Manaye Li, Yu-Zhen Bayeh, Anteneh Wodaje Ou, Yun-Ting Huang, Zih-Jhong Chiang, Tai-Chin Huang, Hsin-Chih Wang, Chen-Hao Department of Materials Science and Engineering National Taiwan University of Science and Technology Taipei106335 Taiwan Department of Chemistry Debre Berhan University Po. Box 445 Debre Berhan Ethiopia King George VI Street Addis Ababa1000 Ethiopia King George VI Street Addis Ababa1000 Ethiopia Global Development Engineering Program National Taiwan University of Science and Technology Taipei106335 Taiwan Research Center National Cheng Kung University Tainan70101 Taiwan Advanced Manufacturing Research Center National Taiwan University of Science and Technology Taipei106335 Taiwan

Recently, discovering high-performance electrocatalytic materials for vanadium redox flow batteries (VRFBs) has been one of the most crucial tasks. This paper details the successful fabrication of a low-cost platelike bismuth vanadate (BiVO4) material through a simple one-step hydrothermal route, employed as an electrocatalyst to adorn graphite felt (GF) for use as the negative electrode in VRFBs. The experimental results show that BiVO4-3h exhibits the optimal electrocatalytic activity and reversibility for the vanadium redox couples among all samples. The energy efficiency of the VRFB cell assembled with BiVO4-decorated GF as the negative electrode is found to be 75.42% at 100 mA cm-2, which is about 10.24% more efficient than that of the cell assembled with a heat-treated graphite felt (HT-GF) electrode. The possible reasons for the activity enhancement can be ascribed to the existence of oxygen vacancies in the BiVO4 lattice structure and the relatively high surface area of BiVO4, which provide more active sites for facilitating the vanadium redox reactions. Furthermore, the BiVO4-GF electrode obstructs the competitive irreversible hydrogen evolution reaction on the negative side of the cell, and it also has better wettability. Impressively, BiVO4-GF as the negative electrode shows good stability over 100 cycles. © 2023 American Chemical Society.

关键词： Electrocatalysts

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Eliminating the Bias from Liquid-Junction Potential for Charge-Transfer Analysis

Eliminating the Bias from Liquid-Junction Potential for Char...

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9th Symposium on Organic Semiconductor materials, Devices, and Processing, held at the 245th ECS Meeting

作者： O’Mari, J.O. Vullev, V.I. Department of Bioengineering University of California RiversideCA92521 United States Department of Chemistry University of California RiversideCA92521 United States Department of Biochemistry University of California RiversideCA92521 United States Materials Science and Engineering Program University of California RiversideCA92521 United States

ISBN: (纸本)9781623326784

Liquid junctions in electrochemical cells introduce potentials that can strongly affect measurements. Such liquid-junction potential errors can exceed 100 mV. In the analysis of charge-transfer thermodynamics, error differences of 100 mV can have substantial impact on the interpretations. Discussion herein outlines an approach for eliminating the effects of liquid-junction potentials from charge-transfer analysis. © The Electrochemical Society.

关键词： Charge transfer

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Electron Cloaking in MoS2 for High-Performance Optoelectronics

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Nano letters 2025年第23期25卷 2025 May 28页

作者： Yu-Xiang Chen Jian-Jhang Lee Ding-Rui Chen You-Chen Lin Hao-Ting Chin Xiu-Yu Huang Sheng-Kuei Chiu Chu-Chi Ting Mario Hofmann Ya-Ping Hsieh Institute of Atomic and Molecular Sciences Academia Sinica Taipei 10617 Taiwan. International Graduate Program of Molecular Science and Technology National Taiwan University Taipei 10617 Taiwan. Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei 10617 Taiwan. Department of Electronic Engineering Chung Yuan Christian University Taoyuan 320 Taiwan. Department of Physics National Taiwan University Taipei 10617 Taiwan. Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei 10617 Taiwan. Department of Materials Science and Engineering Feng Chia University Taichung 407 Taiwan. Department of Materials Science National University of Tainan Tainan 70005 Taiwan. Graduate Institute of Opto-Mechatronics Department of Mechanical Engineering National Chung Cheng University Chia-Yi 62102 Taiwan.

Defects in two-dimensional (2D) materials represent both challenges and opportunities to their optoelectronic performance. While defects limit the carrier mobility in transistors through increased charge scattering, they also enhance 2D material functionality in sensors. Electron cloaking, a process that reduces Coulomb scattering via localized electron-defect interactions, has recently been shown to mitigate the performance degradation of bulk semiconductors in the presence of defects. We demonstrate the realization of electron cloaking in 2D materials through the metal decoration of defects. Sulfur vacancies were introduced in MoS and selectively decorated with aluminum using atomic layer deposition. Theoretical and experimental characterization demonstrate the suppression of electronic scattering through localized interactions. Optoelectronic measurements reveal a significant improvement in carrier mobility and lifetime, highlighting the effectiveness of the cloaking mechanism. Our findings open a route independently to maximize performance and functionality of optoelectronic devices, which is illustrated by the realization photosensors with unprecedented sensitivity and speed.

关键词： 2D material Coulomb scattering MoS2 defect-limited mobility electron cloaking electron−defect interaction vacancies

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